Hydraulic pumping unit



March 30, 1965 R. o. DULANEY HYDRAULIC PUMPING UNIT 3 Sheets-Sheet 2Filed Jan. 3, 1964 .N .mu

March 30, 19755 R. o. DULANY Y 3,175,513

HYDRAULIC FUMPlNGr UN IT Filed Jan. 5, 1964 r .v s sheets-sheet 5 .1r/G.s.

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v 4 INVENTOR. ,Y P/@m90 o.- 004 ,QA/Ex United States Patent O 3,175,513HYDRAULIC PUNHING UNIT Richard 0. Dulaney, 1403 Continental NationalBank Bldg., Fort Worth, Tex. Filed Jan. 3, 1964, Ser. No. 335,588 10Claims. (Cl. 103-206) This invention relates to hydraulic well pumps,and more particularly to a hydraulic well pump of the walking beam type.

A main object of the invention is to provide a novel and improvedhydraulic well pump which is simple in construction, which is eiiicientin operation, and which is relatively compact in size.

A further obiect of the invention is to provide an improved hydraulicwell pump of the walking beam type which is actuated by a hydrauliccylinder, the pump involving relatively inexpensive parts, being durablein construction, which is smooth in operation, and which can beaccurately adjusted to provide optimum speed of operation.

A still further object of the invention is to provide an improvedhydraulic well pump of the walking beam type which employs a hydrauliccylinder for operating the walking beam and a distributing valve forcontrolling the supply of hydraulic fluid to the operating cylinder, thepump having improved means for eiciently and accurately controlling theaction of the distributing valve so as to provide optimum performance ofthe main hydraulic cylinder, whereby the pump may be operated at highefciency with substantial savings in fuel or power costs.

Further objects and advantages of the invention will become apparentfrom the following description and claims, and from the accompanyingdrawings, wherein:

FIGURE 1 is a side elevational view of an improved hydraulic `pumpconstructed in accordance with the present invention, showing thewalking beam thereof in a substantially horizontal position, and with awell string secured to its horsehead.

FIGURE 2 is an enlarged, partly diagrammatic vertical cross sectionalview showing the distributing valve and the associated valve operator orpilot valve assembly, as employed in the hydraulic pump shown in FIGUREl, the fluid connections being shown diagrammatically by dotted lines.

FIGURE 3 is a somewhat enlarged transverse vertical i cross sectionalView taken substantially on the line 3--3 of FIGURE 1.

FIGURE 4 is an enlarged horizontal plan view taken substantially on theline 4-4 of FIGURE 1.

FIGURE 5 is a longitudinal vertical cross sectional view takensubstanitally on the line 5-5 of FIGURE 4.

FIGURE 6 is a transverse vertical cross sectional view takensubstantially on the line 6-6 of FIGURE 5.

FIGURE 7 is a transverse vertical cross sectional view takensubstantially on the line 7-7 of FIGURE 5.

IGURE 8 is a somewhat enlarged transverse vertical cross sectional viewtaken substantially on the line 8--8 of FIGURE l.

Referring to the drawings, the improved hydraulic well pump assembly isdesignated generally at 11 and comprises an open rectangular base frame12 constructed of channel irons and comprising the parallel longitudinalchannel bars 13, 13 which are connected by transverse end channel bars14. A central Samson post 15 rises from the frame 12 and comprises twopairs of upwardly and laterally inwardly convergent legs 16 which aresuitably secured to their lower ends to the side bars 13, 13. The pairsof legs 16 converge upwardly and longitudinally inwardly towards eachother and are rigidly secured at their top ends to the corner portionsof the horizontal base member 17 of an upstanding transverse bearing 18on which is pivotally mounted an upper bearing plate 19 which is in turnrigidly secured to the bottom ange 20ct an I-beam walking beam member21, at an intermediate location along the walking beam member.

The walking beam member 21 is provided with the forward horsehead 22,land connected thereto at 23 is a well pumping string 24.

Designated at 25 is a counterweight member which is slidably engaged onthe top flange 26 of the walking beam member 21, beingr formed with aT-shaped longitudinal groove 27 which receives the top ange 26 and asubstantial portion of the web of the walking beam member 21, as shownin FIGURE 6. The counterweight 25 i-s slidable between a pair of stopsleeves 28 and 29 engaged on and secured to the top flange 26 of thewalking beam member 21, the sleeves being provided with clamping screws30 which are threadedly engaged through their bottom lianges and whichare clampingly engageable with the underside of the top flange 26 of thewalking beam member 21, whereby to secure the sleeves on said topflange, as illustrated in FIGURE 7.

Secured to the forward end of the counterweight member 25 is a forwardlyextending piston rod 31 provided at its forward end with a piston 32rigidly connected thereto and received in a hydraulic cylinder 33, lforcontrolling the position of the counterweight member 25 on the walkingbeam member 21. A conduit 34 is connected to the rear end or" thecylinder 33 and another conduit 35 is connected to the forward end ofsaid cylinder.

Pivoted to the intermediate portion of the top flange of the front crossmember 14, as shown at 36, is an upwardly extending iiuid pressurecylinder 37 The cylinder 37 is provided with a piston having a pistonrod 3d whose top end is pivotally connected at 39 to the bottom flange2d of walking beam member 21 adjacent to horsehead 22. As shown inFIGURE 3, the cylinder 37 contains the piston, shown at 40, which isadapted to be moved upwardly or downwardly in the cylinder by hydrauliciiuid admitted to the respective opposite ends of the cylinder. Apressure fluid supply conduit 41 is connected through a flexible conduitsection 42 to the lower end of the cylinder 37 at one side thereof, asshown in FIGURE 3, whereas a second hydraulic iiuid supply conduit 45 isconnected through a exible conduit section -44 and a connection conduit43 to the top end of the tion 49 and a cylinder connection conduit 50 tothe top end of the cylinder 37 at the opposite side relative to Vtheconnection conduit 43.

Designated generally at 51 is a reciprocating distributing valveassembly which is mounted in any suitable manner horizontally on theSamson post 16, the valve assembly 51 comprising an elongated cylinder53 containing the slidable core member 54 and provided with therespective opposite end caps 55 and 56 communicating with hydrauliciiuid supply conduits 57 and 58, as shown in FIGURE 2. The cylinder 53has respective diametrically opposed pairs of ports 59 and 60, 61 and62, 63 and 64, and 65 and 66. The pairs of ports are spaced along thecylinder 53 in the manner generally illustrated in FIGURE 2, and thecore member 54 is provided with spaced sets of annular grooves 67, 68,69 and 7d located to at times interconnect the aforesaid pairs of ports.*to its extremerightward position, as shown in FIGURE 2,

tadjustable ypivotal connection at 94.

Thus, with the core member 54 thegrooves 67 simultaneouslyy interconnectthe ports 59 and 60, while the grooves 569 interconnect the ports 63`and '64, the'othe'r remaining pairs of ports 61 and 62,

and 65 and 66', being sealed orf relative to each other.

Similarly, when the' core member `54 is in its extreme ieftwardposition, the grooves 68 interconnect the ports 61 and 62 and thegrooves 70 interconnect the ports 65 and 65, whereas the other pairs ofports 59 and 60 and 63, 64 -are sealed oif relative to each other.

A hydraulic'luid'pressure supply line 71 is connected to -a conduit 72havingV respective branches 73 and 74 connected tothe ports 62 and 64.The conduit 34 is connected through a ilexible conduit section 75 to aconduit'76, which in turn is connected to the port 61.

YA branch conduit 77 connects conduit 76 to conduit 43,

which is connected in turn to the port 60. The conduit 35 is connectedthrough a flexible conduit section 78 to a conduit 79, which in turn isconnected to the port 63. A branch conduit 80 connects conduit 79 to theconduit Y'46, which in turn is connected to the port 66. Conduit 57, asshown in FIGURE 2.

Designated at 89 is a pilot valve cylinder for controlling the operationof the core 54, said cylinder 09 being pivoted at 90 to the `Samson post16. The cylinder 89 is provided with a sliding plunger 91 having aplunger rod 92 which extends slidably and sealingly through a -glandassembly 93 provided at the top end of cylinder 89 and is pivotallyconnected at 94 to an adjustable support member 95 whichslidablyembraces the bottom flange 20 of the walking beam member 21, asshown in FIGURE 8. A manually rotating adjusting screw-96 is vjournaledat its opposite end portions in brackets 97 and 98 secured to the bottomflange 20 of walking beam member 21, the screw member 96 beingthreadedly engaged through .a` depending lug 99 provided onmember 95, sothat the position of said member 95 may be adjusted 4along the flange 20by rotating the screw 96. VThe screw `96 is provided with a crank handlek100 for manually -rotating same. The aforesaid adjustment of positionof the member 95 adjusts the pivotal connection 94 of piston rod 92along the ange 20. The cylinder 89 is `provided with the Ytwo `spacedintermediateV ports 101 and 102, the Vflexible conduit S being connectedto the upper port 101 and the flexible conduit 57 kbeing con gnected tothe lower port 102.Y The conduit 72 .is Vcon-V nected through a exibleconduit section 103 to ythe bottom end of cylinder 89, namely, to abottom conduit 104. The bottom conduit 104 Vis connected by a conduit105 to the top end ofcylinder 89, so that equal hydraulic yiiuidpressure is provided at the top and bottom ends of the cylinder. A dummypiston rod 106 is secured to the bottom end of the plunger v91 andextends through a seal- -ing.gland 107 Vat the bottom fend' ofcylinder89, to balvance the` 'pressure effect of the operating rod '92.By virtue of this arrangement, the plunger 91V is not affected -bythehydraulic uid ypressure but is operated .merely by the movement of thewalking beam 21 through ythe In the lowermost FIGURE 1.

. 4 under pressureV to flow through the conduit 57 to the right end ofcylinder 53, whereby the hydraulic iiuid acts against the core 54 andmoves the core to the left. As shown in FIGURE 2, in the rightwardposition of the core 54, grooves 67 connect ports 59 and 60fand grooves69 connect ports 63-and 64. Hydraulic uid under pressure flows from line71 to the conduit 74, port 64, grooves 69, port 63 and conduits 79, 7 8andv 35 into the right end of cylinder 33, Vas viewed in FiF-URE 1,urging piston 32 to the left, and causing ythercounterweight 25 to movesimilarly, namely, toward the stop 29. Hydraulic iluid is ailowed todischarge from the left end portion of cylinder 33 to conduits 34, 75,77, 48, port 60, grooves 67, port-59 and conduit 82 to the return line81. A predetermined amount of returned fluid flows from conduit toconduit 82 through the needle valve 87. At the same time, hydraulicfluid under pressure flows from line 71 through conduit 74, port 64,grooves 69, port 63, conduit 79 and conduits k41 and 42 to the bottomend of the main operating cylinder 37, driving the piston 40 upwardly,the hydraulic uid in the upper part of the cylinder discharging to thehydraulic iiuid reservoir through conduits 50, .49 and 48, port 60,grooves 67, port 59, conduit `82 and conduit `81. VThe resultant upwardmovement ofthe forward end portion of walking beam 21 elevates thepivotalV connection 94, raising the `plunger 91 to its yuppermostposition in cylinder 89,

thereby establishing communication between conduit 104 and port 102.This closes of port 101 and allows hydraulic uid under pressure to filowto the right end of cylinder 53 from conduit 71 through conduit 72,conduit 103, port 102 andconduit 57. This drives the core 54 to itsleftward position, the fluid in the left end of `the cylinder'53 beingallowed to pass to the discharge ,conduit 82 through the conduit 85 andthe needle valve S7. The rate of movement of the core 54 may thus beregulated by adjusting the needle kvalve 87.

When the Walking `beam 21 has been thus rotated to elevate the'horsehead22, the upward movement of the plungerAV 91 causes hydraulic iiuid underpressure to be delivered to the right end of cylinder 53, as viewed in`.FIGURE 2, moving the core 54 at a timed rate, depending upon theadjustment of valve S7, so that it reaches its extreme leftwardposition, causing areversal of move- -ment ofthe Walking beam, namely,establishing the hydraulic connections required to move the piston 40downwardly and to move ithecounterweight 25 to the right, namely,towardthe rightstop member 23, shown in This lowers .the plunger 91 tothe position thereof shown in FIGURE 2, re-establishingcommunicationfbetween the top portion ofthe cylinder S9 and port 101,Yso that hydraulicuid under pressure may flow through conduit 58 to theleft end of cylinder 53,

theluid in' the right end-of cylinder 53 being discharged position ofthe plunger 91, the top end portion of 'the v,cylinder-*89 is connectedto the port 101, and thence uppermost 'position incylinder9, the conduit104 communicates' with theA port 102, nallowing `hydraulic uidthroughrconduit Srand the adjustable needle valve 8S to the dischargeconduit 83. The Yrate of discharge of -the hydraulic fluid from theright endy of cylinder 53 may similarly be regulated by adjusting theneedle valve 88. The raterof movement of the core54 may thus bevindependently regulated foreither direction of its movement, because ofthe independent adjustment provided Iof* the needle valves 87 and. Thetiming of the movevment of the coremember 54 may also be accuratelyadjusted by adjusting the position of the pivotalconnection-94-by-means'of crank handle 100 Vassociatedwith screw 96.ThisV adjustment is independent of the value of the hydraulic`1iuidpressure,-since the pressures in the top and bottom portions ofthe pilot valve cylinder '89 are lalways equal, so that the hydrauliciluid exerts no effective force on the plunger 91, andthe movement ofsaid plunger is regulated solely by the movements of `the Walking beam21.

ance with the rocking movement of the walking beam 21 to alternatelyexpose its ports 101 and 102 to the pressure iluid delivered to theinlet conduit 104 and supplied to the top and bottom end portions ofcylinder 39. The core 54 is thus reciprocated, the reciprocatingmovement of the core being regulated in speed by the adjustment of theneedle valves 87 and 88, as above explained. This correspondinglyregulates the speed of the upward and downward movement of the piston 40in the ram cylinder 37 and similarly regulates the forward and rearwardreciprocating movement of the piston 32 in the counterweight operatingcylinder 33. When piston 40 is moved upwardly, namely, in a direction toelevate the horsehead 22, the piston 32 is moved rearwardly, moving thecounterweight 25 toward the stop 29, which adds to the lifting momentacting on the horsehead 22 and urging the walking beam 21 in acounterclockwise direction, as viewed in FGURE 1. The upward movement ofthe hydraulic piston rod 38 is concurrent with the upward movement ofthe pilot valve piston rod 92, so that at the end of the upward strokethe lower port 102 of the pilot valve is exposed to the pressure iluid,causing reversal of the distributing valve l., thereby reversing thedirection of movement of pistons 40 and 32. As a result, the horsehead22 is moved up and down, following the rocking motion of the walkingbeam 21. This motion continues until the supply of pressure fluid toline '71 is cut ott.

An important feature of the present invention is the provision of theneedle valves 88 and 87 to control the speed of travel of the plungercore 54 in the distributing valve 51, and also the provision of thedummy rod 196 in the pilot valve 89 to equalize the pressure at theopposite ends of the pilot valve chamber. It will be further noted thatthe apparatus includes means to shift the counterweight member 25 in amanner to balance the up and down strokes and to cooperate with the mainhydraulic ram assembly. The apparatus includes the necessary structureto provide the necessary increased lifting power for the upward strokeof the drill string, which usually requires of the order of fiftypercent more power than the downward stroke. At the same time, therequired mass of the counterweight 25 is held to a minimum. The uidpressure lines are connected to both cylinders 37 and 33 at the sametime, so that the counterweight 25 is operated to equalize the load, onthe upstroke, and to facilitate the elevation thereof by the mainhydraulic ram assembly, enabling automatic and rapid lifting of the loadon the upstroke.

While a specific embodiment of an improved hydraulic Well pump has beendisclosed in the foregoing description, it will be understood thatvarious modifications within the spirit of the invention may occur tothose skilled in the art. Therefore, it is intended that no limitationsbe placed on the invention except as defined by the scope of theappended claims.

What is claimed is:

1. A hydraulic well pump comprising a base, an upstanding Samson post onthe base, a generally horizontal walking beam pivoted intermediate itsends on the post, a well string secured to one end of the walking beam,a counterbalance weight slidably mounted on the walking beam adjacentits opposite end, a hydraulic cylinder mounted on the walking beam inparallel relationship thereto and having a piston provided with a pistonrod, means connecting said piston rod to said counterbalance weight, ahydraulic ram pivoted to the Walking beam opposite said counterbalanceweight and pivoted on the base, distributing valve means connectedbetween said hydraulic cylinder and said hydraulic ram, a hydraulicvalve operator, said valve operator comprising a pilot valve cylindermember containing a plunger member, one of said members being pivotallyconnected to the walking beam and the other member being pivotallyconnected to the post, the plunger member being continuously moved inthe cylinder member as the walking beam oscillates on the post, ahydraulic return line connected to the distributing Valve means and tothe valve operator, and a uid pressure line connected to thedistributing valve means through the valve operator, said valve operatorbeing provided with means to operate the distributing valve meansresponsive to the movement of the plunger member in the cylinder member.

2. A hydraulic well pump comprising a base, an upstanding Samson post onthe base, a generally horizontal walking beam pivoted intermediate itsends on the post, a well string secured to one end of the walking beam,a counterbalance weight slidably mounted on the walking beam adjacentits opposite end, a hydraulic cylinder mounted on the walking beam inparallel relation thereto and having a piston provided with a pistonrod, means connecting said piston rod to said counterbalance Weight, ahydraulic ram pivoted to the Walking beam opposite said counterbalanceweight and pivoted on the base, distributing valve means connectedbetween said hydraulic cylinder and said hydraulic ram, a hydraulicvalve operator operatively connected to said distributing valve means,said valve operator comprising a pilot cylinder member containing aplunger member, one of said members being pivotally connected to thewalking beam and the other member being pivotally connected to the post,the plunger member being continuously moved in the cylinder member asthe walking beam oscillates on the post, a hydraulic return lineconnected to the distributing valve means and to the valve operator, anda fluid pressure line connected to the distributing valve means throughthe valve operator, said valve operator being provided with means tooperate the distributing valve means responsive to the movement of theplunger member in the cylinder member.

3. A hydraulic well pump comprising a base, an upstanding Samson post onthe base, a generally horizontal walking beam pivoted intermediate itsends on the post, a well string secured to one end of the walking beam,a counterbalance weight slidably mounted on the walking beam adjacentits opposite end, a hydraulic cylinder mounted on the walking beam inparallel relation thereto and having a piston provided with a pistonrod, means connecting said piston rod to said counterbalance weight, ahydraulic ram pivoted to the walking beam opposite said counterbalanceweight and pivoted on the base, distributing valve means connectedbetween said hydraulic cylinder and said hydraulic ram, a hydraulicvalve operator, said valve operator comprising a pilot valve cylindermember containing a plunger member, one of said members being pivotallyconnected to the walking beam and the other member being pivotallyconnected to the post, the plunger member being continuously moved inthe cylinder as the walking beam oscillates on the post, said valveoperator having a pair of outlet ports connected to opposite ends ofsaid distributing valve means and having hydraulic uid inlet means,means to communicatively connect said inlet means alternately to saidoutlet ports responsive to the movement of the plunger member to tworespective predetermined positions in the cylinder member, a luidpressure line connected to said distributing valve means and said uidinlet means, a hydraulic return line connected to the distributing valvemeans, and means in said distributing valve means to connect said fluidpressure line alternately to opposite ends of said cylinder responsiveto the admission of pressure fluid into the opposite ends of saiddistributing valve means and to simultaneously operate said hydraulicram.

4. A hydraulic well pump comprising a base, an upstanding Samson post onthe base, a generally horizontal walking beam pivoted intermediate itsends on the post, a Well string secured to one end of the walking beam,a counterbalance weight slidably `mounted on-the walking beamfadjaentits opposite end, a hydraulic:V cylinder mounted on the walking beam inparallel relation lthereto andjhaving a piston Aprovided with a pistonrod,

means connecting said piston rod to said counterbalance weight, ahydraulic Vrampivotedto the walking beamV opposite said counterbalanceweight and pivoted on thel nected to the post, the plunger member beingcontinuously moved inthe cylinderrnember as the walking beam oscillateson the post, said valve operatorhaving a pair of outlet ports connectedto opposite ends ofnsaid distributing valve means and having hydraulicfluid inlet means, means Vto communicatively connect said inlet meansalternately to said outlet por-ts responsive to the movement of theplunger-member to two respective predetermined positions in the cylindermember, a iiuid pressure line connected to said distributing valve meansand said fluid inlet means, a hydraulic return line connected to thedistributing valve means,;means in said Adistributing valve meanspftoconnect said .fluid pressure line alternately to opposite vends of saidcylinder responsive to the admission of pressure'fluid into the oppositeends of said distributing valve means and to simultaneously operate saidhydraulic ram, and restricted bypass means connecting each end of saiddistributing 4valve means to the hydraulic return line.

5. A hydraulic well pump comprising a base, an npstandingkSamson post onthebase, a generally horizontal-walking'beam pivoted intermediate itsends on the post, a well string secured to one end of the walking beam,a counterbalance'weight slidably mounted on the Walking beam adjacentits opposite end, a hydraulic cyl-V inder mounted on the Walking beam inparallel relation thereto and having a piston provided Vwith a pistonrod, means connecting said piston rod to said counterbalance weight, ahydraulic ram pivoted to the walking beam opposite said counter balance:weight andpivoted on the base, distributing valve'means connectedbetween said hydraulic cylinder and said hydraulic ram, a hydraulicValve operator, said valve operator comprising a pilot valve cylindermembercontaining a plunger member, one vofsaid members being pivotallyconnected to the walking beam and the other member being pivotallyvconnected to the post, the plunger member being continuously movedinthe cylinder member as the Walking beam oscillates onthe post, saidvalveoperator having a pair of outlet ports connected to opposite endsof said distributing valve means and havinghydraulic fluid inlet means,means to communicatively connect said in- 'let means. alternately tosaid outlet ports responsive to `the movement ofthe plunger member totwo respective predetermined positions in the cylinder member, a duidpressure line connected to said distributing valve Lmeans and said fluidinlet means, a V,hydraulic return vline connected to thedistributingvalve means, means `in said distributing valve means toconnect said fluid fduit meansconnecting each end of said distributingvalve Vmeansto thefhydraulic return line, each of said last- 'namedconduit `means includingta variable restriction.

6. A hydraulic well pump comprisingr a base, an upstanding Samson poston the base, a generally horizontal vWalking beam pivoted intermediateits ends on the post, a well string secured to one `endfof the walkingjbeam, a counterbalance weight slidably mountedon Vthe Walking beamadjacent its opposite end, a hydraulic cyl- Vinder mounted-.on thewalking beam in parallel relation .thereto and having a .piston providedwith a piston rod, ymeans connecting said position rod to saidcounterbal- .ance weight, a hydraulic ram pivoted to the walking beamVvopposite, said counterb'alance weight and pivoted yon the base,distributing valve means connected between .said hydraulic cylinder andsaid hydraulic ram, a hydraulic valve operator,` said valve operator.comprising yarpilotvalve cylindermember containing a plunger meL ber,one of said members being pivotally connected to the walking beam andthe other member being pivotally .connected to the post, theplungerrmember being continuously moved in the cylinder member as thewalking beam oscillates on the post, said valve operator having a pairof outlet ports connected to opposite ends of said distributing valvemeans and having hydraulic fluid inlet means, means to communicativelyconnect said inlet means alternately to `said V,outlet ports responsiveto the movement of the plunger member `to two respective predeterminedpositions in the cylinder member, a iiuid pressure line connected tosaiddistributing valve means and said fluid inlet means, a'hydraulic returnline connected to the distributing valve means,rmeans in saiddistributing valve means toV connectsaid iluid pressure line alternatelyto oppositeends of said cylinder responsive to the admission oi pressureiiuid into the opposite ends of said distributing valve means and tosimultaneously operate said hydraulic ram, and conduit means connectingeach ,end of. said distributing valve means to theY hydraulic returnline, .each of said last-named conduit means including amanuallyadjustableneedlervalve arranged to adjust the eiiective crosssectional area thereof.

7. A hydraulic well pump comprising a base, an u standing Samson post onthelbase, a generally horizontal Walking beam pivoted intermediate Vits`ends on the post, alwell stringfsecured to one end of the walking beam,a counterbalance Weight slidably mounted on the walking beam adjacentits opposite en d, a hydraulic cylinder Ymounted on theV walking beam inparallel relation thereto and having a pistonprovided with a piston rod,means connecting said piston rod to said counterbalance weight, ahydraulic ram pivoted to the walking beam opposite said counterbalanceweightand pivoted on the base, distributing valve means connectedbetween said hydraulic cylinder and said hydraulic ram, a hydraulicvalve operator, said Valve Voperator comprising an elongated valvechamber Vhaving a pair uof intermediate spaced outlet ports .connected,to opposite ends .of said distributing valve means and having hydraulicuid inlet means at its Vopposite end portions, a valve element slidablymounted in said chamber, the opposite ends of the hydraulic valveoperator being respectively pivotally connected to the walking beam 0none side of the post .and to said post so that the valve element iscontinuously movedi in the valve chamber as the walking beam oscillateson the post, said valve element being moved a sufticient distance insaid chamber 'by the oscillation oi the Walking beam `to alternatelycommunicatively connect Adistributing valve means, and means in saiddistributing valve means to connect said iluid pressure line alternatelyVto opposite ends of said cylinder responsive to the alternate admissionof pressure iluid into the opposite ends of said distributing valvemeans and to simultaneously operater` said hydraulic ram.

8. A hydraulic Ywell pump comprising a base, an upstanding Samson poston the base, a generally horizon- -tal walking beam pivoted intermediateits ends on the post, 'a well string secured to one end of'the walkingbeam, acounterbalance-weight slidably mounted ron the walking beamadjacent itsy opposite end, a hydraulic cylinder mounted on thenwalkingbeam in-fparallel relation theretoY and having a piston .provided Vwitha piston rod,

means connecting said piston rod to said counterbalance weight, ahydraulic ram pivoted to the walking beam opposite said counterbalanceweight and pivoted on the base, distributing valve means connectedbetween said hydraulic cylinder and said hydraulic ram, a hydraulicvalve operator, said valve operator comprising an elongated valvechamber having a pair of intermediate spaced outlet ports connected toopposite ends of said distributing valve means and having hydraulicfluid inlet means at its opposite end portions, a valve element slidablymounted in said chamber, the opposite ends of the hydraulic valveoperator being respectively pivotally connected to the walking beam onone side of the post and to said post so that the valve element iscontinuously moved in the valve chamber as the walking beam oscillateson the post, said valve element being moved a sufcient distance in saidchamber by the oscillation of the walking beam to alternatelycommunicatively connect said inlet means to said outlet ports, a uidpressure line connected to said distributing valve means and said inletmeans, a hydraulic return line connected to said distributing valvemeans, means in said distributing valve means to connect said fluidpressure line alternately to opposite ends of said cylinder responsiveto the alternate admission of pressure fluid into the opposite ends ofsaid distributing valve means and to simultaneously operate saidhydraulic ram, and restricted bypass means connecting each end of saiddistributing valve means to the hydraulic return line.

9. A hydraulic well pump comprising a base, an upstanding Samson post onthe base, a generally horizontal walking beam pivoted intermediate itsends on the post, a well string secured to one end of the walking beam,a counterbalance Weight slidably mounted on the Walking beam adjacentits opposite end, a hydraulic cylinder mounted on the Walking beam inparallel relation thereto and having a piston provided with a pistonrod, means connecting said piston rod to said counterbalance Weight, ahydraulic ram pivoted to the Walking beam opposite said counterbalanceWeight and pivoted on the base, distributing valve means connectedbetween said hydraulic cylinder and said hydraulic ram, a hydraulicvalve operator, said valve operator comprising an elongated valvechamber having a pair of intermediate spaced outlet ports connected toopposite ends of said distributing valve means and having hydrauliciluid inlet means at its opposite end portions, a valve element slidablymounted in said chamber, the opposite ends of the hydraulic valveoperator being respectively pivotally connected to the walking beam onone side of the post and to said post so that the valve element iscontinuously moved in the valve chamber as the walking beam oscillateson the post, said valve element being moved a suicient distance in saidchamber by the oscillation of the walking beam to alternatelycommunicatively connect said inlet means to said outlet ports, a Huidpressure line connected to said distributing valve means and said inletmeans, a hydraulic return line connected to said distributing valvemeans, means in said distributing valve means to connect said uidpressure line alternately to opposite ends of said cylinder responsiveto the alternate admission of pressure uid into the opposite ends ofsaid distributing valve means and to simultaneously operate saidhydraulic ram, restricted bypass means connecting each end of saiddistributing valve means to the hydraulic return line, and means toadjust the point of pivotal connection of said hydraulic valve operatorto the walking beam.

10. A hydraulic well pump comprising a base, an upstanding Samson poston the base, a generally horizontal walking beam pivoted intermediateits ends on the post, a well string secured to one end of the walkingbeam, a counterbalance weight slidably mounted on the walking beamadjacent -its opposite end, a hydraulic cylinder mounted on the walkingbeam in parallel relation thereto and having a piston provided with apiston rod, means connecting said piston rod to said counterbalanceWeight, a hydraulic ram pivoted to the Walking beam opposite saidcounterbalance Weight and pivoted on the base, distributing valve meansconnected between said hydraulic cylinder and said hydraulic ram, ahydraulic valve operator, said valve operator comprising an elongatedvalve chamber having a pair of intermediate spaced outlet portsconnected to opposite ends of said distributing -valve means and havinghydraulic uid inlet means at `its opposite end portions, a valve elementslidably mounted in said chamber, the opposite ends of the hydraulicvalve operator being respectively pivotally connected to the walkingbeam on one side of the post and to said post so that the valve elementis continuously moved in the valve chamber as the walking beamoscillates on the post, said valve element being moved a sufficientdistance in said chamber by the oscillation of the walking beam toalternately communicatively connect said inlet means to said outletports, a fluid pressure line connected to said distributing valve meansand said inlet means, a hydraulic return line connected to saiddistributing valve means, means in said distributing valve means toconnect said liuid pressure line alternately to opposite ends of saidcylinder responsive to the alternate admission of pressure uid into theopposite ends of said distributing valve means and to simultaneouslyoperate said hydraulic ram, and restricted bypass means connecting eachend of said distributing valve means to the hydraulic return line, saidvalve operator including a walking beam connection rod extendingslidably and sealingly through one end of said elongated valve chamberand connected between the walking beam and said valve element, and apressure balancing dummy rod connected to said valve element andextending slidably and sealingly through the opposite end of saidelongated valve chamber.

References Cited by the Examiner UNITED STATES PATENTS 2,432,735 12/47Downing '74--589X LAURENCE V. EFNER, Primary Examiner.

ROBERT M. WALKER, Examiner.

1. A HYDRAULIC WELL PUMP COMPRISING A BASE, AN UPSTANDING SAMSON POST ONTHE BASE, A GENERALLY HORIZONTAL WALKING BEAM PIVOTED INTERMEDIATE ITSENDS ON THE POST, A WELL STRING SECURED TO ONE END OF THE WALKING BEAM,A COUNTERBALANCE WEIGHT SLIDABLY MOUNTED ON THE WALKING BEAM ADJACENTITS OPPOSITE END, A HYDRAULIC CYLINDER MOUNTED ON THE WALKING BEAM INPARALLEL RELATIONSHIP THERETO AND HAVING A PISTON PROVIDED WITH A PISTONROD, MEANS CONNECTING SAID PISTON ROD TO SAID COUNTERBALANCE WEIGHT, AHYDRAULIC RAM PIVOTED TO THE WALKING BEAM OPPOSITE SAID COUNTERBALANCEWEIGHT AND PIVOTED ON THE BASE, DISTRIBUTING VALVE MEANS CONNECTEDBETWEEN SAID HYDRAULIC CYLINDER AND SAID HYDRAULIC RAM, A HYDRAULICVALVE OPERATOR, SAID VALVE OPERATOR COMPRISING A PILOT VALVE CYLINDERMEMBER CONTAINING A PLUNGER MEMBER, ONE OF SAID MEMBERS BEING PIVOTALLYCONNECTED TO THE WALKING BEAM AND THE OTHER MEMBER BEING PIVOTALLYCONNECTED TO THE POST, THE PLUNGER MEMBER BEING CONTINUOUSLY MOVED INTHE CYLINDER MEMBER AS THE WALKING BEAM OSCILLATES ON THE POST, AHYDRAULIC RETURN LINE CONNECTED TO THE DISTRIBUTING VALVE MEANS AND THEVALVE OPERATOR, AND A FLUID PRESSURE LINE CONNECTED TO THE DISTRIBUTINGVALVE MEANS THROUGH THE VALVE OPERATOR, SAID VALVE OPERATOR BEINGPROVIDED WITH MEANS TO OPERATE THE DISTRIBUTING VALVE MEANS RESPONSIVETO THE MOVEMENT OF THE PLUNGER MEMBER IN THE CYLINDER MEMBER.